So my drivetrain is not shifting correctly. It is a little sluggish on up and down shifts but nothing crazy. The problem I am having is that shifting up (aka going from the biggest gear 42t on my Sunrace cassette) it skips the next gear and jumps down two. The derailleur is lined up with that gear (8th out of ten). Shifting down it goes to that gear (9th) fine. Any suggestions? The drivetrain was transplanted off my broken Niner and I am trying to set it up on my Big Wig. It is a 2 month old SRAM X9 shifter with new cable, an older but not much used SRAM derailleur and a Sunrace 11-42 cassette. 1x. It was shifting super slowly but once I adjusted the cable to get rid of that it started skipping 9th. It looks like the derailleur lines up fine with the cassette.